From 38dc12ef0d83eb8f036f18412dad61f49a6c3730 Mon Sep 17 00:00:00 2001
From: Alexander Skvortsov <sasha.skvortsov109@gmail.com>
Date: Fri, 12 Mar 2021 15:30:14 -0500
Subject: [PATCH] Provide active filters to filter state

---
 .../core/src/Filter/AbstractFilterer.php      |  1 +
 framework/core/src/Filter/FilterState.php     | 25 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/framework/core/src/Filter/AbstractFilterer.php b/framework/core/src/Filter/AbstractFilterer.php
index 736568901..5f07fdbbb 100644
--- a/framework/core/src/Filter/AbstractFilterer.php
+++ b/framework/core/src/Filter/AbstractFilterer.php
@@ -62,6 +62,7 @@ abstract class AbstractFilterer
                 $filterKey = substr($filterKey, 1);
             }
             foreach (Arr::get($this->filters, $filterKey, []) as $filter) {
+                $filterState->addActiveFilter($filter);
                 $filter->filter($filterState, $filterValue, $negate);
             }
         }
diff --git a/framework/core/src/Filter/FilterState.php b/framework/core/src/Filter/FilterState.php
index b9e22611e..5597964da 100644
--- a/framework/core/src/Filter/FilterState.php
+++ b/framework/core/src/Filter/FilterState.php
@@ -13,4 +13,29 @@ use Flarum\Query\AbstractQueryState;
 
 class FilterState extends AbstractQueryState
 {
+    /**
+     * @var FilterInterface[]
+     */
+    protected $activeFilters = [];
+
+    /**
+     * Get a list of the filters that are active.
+     *
+     * @return FilterInterface[]
+     */
+    public function getActiveFilters()
+    {
+        return $this->activeFilters;
+    }
+
+    /**
+     * Add a filter as being active.
+     *
+     * @param FilterInterface $filter
+     * @return void
+     */
+    public function addActiveFilter(FilterInterface $filter)
+    {
+        $this->activeFilters[] = $filter;
+    }
 }